/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.messaging.simp;

import org.springframework.lang.Nullable;
import org.springframework.messaging.Message;
import org.springframework.messaging.handler.DestinationPatternsMessageCondition;
import org.springframework.messaging.handler.MessageCondition;

/**
 * {@link MessageCondition} for SImple Messaging Protocols. Encapsulates the following
 * request mapping conditions:
 * <ol>
 * <li>{@link SimpMessageTypeMessageCondition}
 * <li>{@link DestinationPatternsMessageCondition}
 * </ol>
 *
 * @author Rossen Stoyanchev
 * @since 4.0
 */
public class SimpMessageMappingInfo implements MessageCondition<SimpMessageMappingInfo> {

    private final SimpMessageTypeMessageCondition messageTypeMessageCondition;

    private final DestinationPatternsMessageCondition destinationConditions;


    public SimpMessageMappingInfo(SimpMessageTypeMessageCondition messageTypeMessageCondition,
                                  DestinationPatternsMessageCondition destinationConditions) {

        this.messageTypeMessageCondition = messageTypeMessageCondition;
        this.destinationConditions = destinationConditions;
    }


    public SimpMessageTypeMessageCondition getMessageTypeMessageCondition() {
        return this.messageTypeMessageCondition;
    }

    public DestinationPatternsMessageCondition getDestinationConditions() {
        return this.destinationConditions;
    }


    @Override
    public SimpMessageMappingInfo combine(SimpMessageMappingInfo other) {
        SimpMessageTypeMessageCondition typeCond =
                this.getMessageTypeMessageCondition().combine(other.getMessageTypeMessageCondition());
        DestinationPatternsMessageCondition destCond =
                this.destinationConditions.combine(other.getDestinationConditions());
        return new SimpMessageMappingInfo(typeCond, destCond);
    }

    @Override
    @Nullable
    public SimpMessageMappingInfo getMatchingCondition(Message<?> message) {
        SimpMessageTypeMessageCondition typeCond = this.messageTypeMessageCondition.getMatchingCondition(message);
        if (typeCond == null) {
            return null;
        }
        DestinationPatternsMessageCondition destCond = this.destinationConditions.getMatchingCondition(message);
        if (destCond == null) {
            return null;
        }
        return new SimpMessageMappingInfo(typeCond, destCond);
    }

    @Override
    public int compareTo(SimpMessageMappingInfo other, Message<?> message) {
        int result = this.messageTypeMessageCondition.compareTo(other.messageTypeMessageCondition, message);
        if (result != 0) {
            return result;
        }
        result = this.destinationConditions.compareTo(other.destinationConditions, message);
        if (result != 0) {
            return result;
        }
        return 0;
    }


    @Override
    public boolean equals(Object other) {
        if (this == other) {
            return true;
        }
        if (!(other instanceof SimpMessageMappingInfo)) {
            return false;
        }
        SimpMessageMappingInfo otherInfo = (SimpMessageMappingInfo) other;
        return (this.destinationConditions.equals(otherInfo.destinationConditions) &&
                this.messageTypeMessageCondition.equals(otherInfo.messageTypeMessageCondition));
    }

    @Override
    public int hashCode() {
        return (this.destinationConditions.hashCode() * 31 + this.messageTypeMessageCondition.hashCode());
    }

    @Override
    public String toString() {
        return "{" + this.destinationConditions + ",messageType=" + this.messageTypeMessageCondition + '}';
    }

}
